JAVA 简易计算器

import java.util.logging.Level;

import java.util.logging.Logger;

import javax.script.ScriptEngine;

import javax.script.ScriptEngineManager;

import javax.script.ScriptException;

public class NewJFrame extends javax.swing.JFrame {

public NewJFrame() {

initComponents();

}

@SuppressWarnings("unchecked")

// <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents

private void initComponents() {

jLayeredPane1 = new javax.swing.JLayeredPane();

jPanel3 = new javax.swing.JPanel();

cheng = new javax.swing.JButton();

fanhui = new javax.swing.JButton();

qingling = new javax.swing.JButton();

jButton9 = new javax.swing.JButton();

jButton7 = new javax.swing.JButton();

jButton6 = new javax.swing.JButton();

dengyu = new javax.swing.JButton();

chu = new javax.swing.JButton();

jButton2 = new javax.swing.JButton();

jButton8 = new javax.swing.JButton();

jButton3 = new javax.swing.JButton();

jian = new javax.swing.JButton();

jButton5 = new javax.swing.JButton();

jButton1 = new javax.swing.JButton();

dian = new javax.swing.JButton();

jia = new javax.swing.JButton();

jButton4 = new javax.swing.JButton();

jButton10 = new javax.swing.JButton();

jTextField1 = new javax.swing.JTextField();

jPanel1 = new javax.swing.JPanel();

jLabel1 = new javax.swing.JLabel();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

jPanel3.setOpaque(false);

cheng.setText("*");

cheng.addMouseListener(new java.awt.event.MouseAdapter() {

public void mouseReleased(java.awt.event.MouseEvent evt) {

chengMouseReleased(evt);

}

});

fanhui.setText("←");

fanhui.addMouseListener(new java.awt.event.MouseAdapter() {

public void mouseReleased(java.awt.event.MouseEvent evt) {

fanhuiMouseReleased(evt);

}

});

qingling.setText("C");

qingling.addMouseListener(new java.awt.event.MouseAdapter() {

public void mouseReleased(java.awt.event.MouseEvent evt) {

qinglingMouseReleased(evt);

}

});

jButton9.setText("9");

jButton9.addMouseListener(new java.awt.event.MouseAdapter() {

public void mouseReleased(java.awt.event.MouseEvent evt) {

jButton9MouseReleased(evt);

}

});

jButton7.setText("7");

jButton7.addMouseListener(new java.awt.event.MouseAdapter() {

public void mouseReleased(java.awt.event.MouseEvent evt) {

jButton7MouseReleased(evt);

}

});

jButton6.setText("6");

jButton6.addMouseListener(new java.awt.event.MouseAdapter() {

public void mouseReleased(java.awt.event.MouseEvent evt) {

jButton6MouseReleased(evt);

}

});

dengyu.setText("=");

dengyu.addMouseListener(new java.awt.event.MouseAdapter() {

public void mouseReleased(java.awt.event.MouseEvent evt) {

dengyuMouseReleased(evt);

}

});

chu.setText("/");

chu.addMouseListener(new java.awt.event.MouseAdapter() {

public void mouseReleased(java.awt.event.MouseEvent evt) {

chuMouseReleased(evt);

}

});

jButton2.setText("2");

jButton2.addMouseListener(new java.awt.event.MouseAdapter() {

public void mouseReleased(java.awt.event.MouseEvent evt) {

jButton2MouseReleased(evt);

}

});

jButton8.setText("8");

jButton8.addMouseListener(new java.awt.event.MouseAdapter() {

public void mouseReleased(java.awt.event.MouseEvent evt) {

jButton8MouseReleased(evt);

}

});

jButton3.setText("3");

jButton3.addMouseListener(new java.awt.event.MouseAdapter() {

public void mouseReleased(java.awt.event.MouseEvent evt) {

jButton3MouseReleased(evt);

}

});

jian.setText("-");

jian.addMouseListener(new java.awt.event.MouseAdapter() {

public void mouseReleased(java.awt.event.MouseEvent evt) {

jianMouseReleased(evt);

}

});

jButton5.setText("5");

jButton5.addMouseListener(new java.awt.event.MouseAdapter() {

public void mouseReleased(java.awt.event.MouseEvent evt) {

jButton5MouseReleased(evt);

}

});

jButton1.setText("1");

jButton1.addMouseListener(new java.awt.event.MouseAdapter() {

public void mouseReleased(java.awt.event.MouseEvent evt) {

jButton1MouseReleased(evt);

}

});

dian.setText(".");

dian.addMouseListener(new java.awt.event.MouseAdapter() {

public void mouseReleased(java.awt.event.MouseEvent evt) {

dianMouseReleased(evt);

}

});

dian.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

dianActionPerformed(evt);

}

});

jia.setText("+");

jia.addMouseListener(new java.awt.event.MouseAdapter() {

public void mouseReleased(java.awt.event.MouseEvent evt) {

jiaMouseReleased(evt);

}

});

jButton4.setText("4");

jButton4.addMouseListener(new java.awt.event.MouseAdapter() {

public void mouseReleased(java.awt.event.MouseEvent evt) {

jButton4MouseReleased(evt);

}

});

jButton10.setText("0");

jButton10.addMouseListener(new java.awt.event.MouseAdapter() {

public void mouseReleased(java.awt.event.MouseEvent evt) {

jButton10MouseReleased(evt);

}

});

jTextField1.setHorizontalAlignment(javax.swing.JTextField.RIGHT);

jTextField1.setText("0");

jTextField1.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jTextField1ActionPerformed(evt);

}

});

javax.swing.GroupLayout jPanel3Layout = new javax.swing.GroupLayout(jPanel3);

jPanel3.setLayout(jPanel3Layout);

jPanel3Layout.setHorizontalGroup(

jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(jPanel3Layout.createSequentialGroup()

.addGap(23, 23, 23)

.addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)

.addComponent(jTextField1)

.addGroup(jPanel3Layout.createSequentialGroup()

.addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)

.addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(jPanel3Layout.createSequentialGroup()

.addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(jPanel3Layout.createSequentialGroup()

.addComponent(jButton4)

.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)

.addComponent(jButton5))

.addGroup(jPanel3Layout.createSequentialGroup()

.addComponent(jButton7)

.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)

.addComponent(jButton8)))

.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)

.addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addComponent(jButton6)

.addComponent(jButton9)))

.addGroup(jPanel3Layout.createSequentialGroup()

.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 39, javax.swing.GroupLayout.PREFERRED_SIZE)

.addGap(10, 10, 10)

.addComponent(jButton2)

.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)

.addComponent(jButton3)))

.addGroup(jPanel3Layout.createSequentialGroup()

.addComponent(jButton10, javax.swing.GroupLayout.PREFERRED_SIZE, 88, javax.swing.GroupLayout.PREFERRED_SIZE)

.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)

.addComponent(dian)))

.addGap(18, 18, 18)

.addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)

.addGroup(jPanel3Layout.createSequentialGroup()

.addComponent(cheng)

.addGap(18, 18, 18)

.addComponent(qingling, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))

.addGroup(jPanel3Layout.createSequentialGroup()

.addComponent(chu)

.addGap(18, 18, 18)

.addComponent(fanhui, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE))

.addGroup(jPanel3Layout.createSequentialGroup()

.addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addComponent(jia)

.addComponent(jian))

.addGap(18, 18, 18)

.addComponent(dengyu, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)))))

.addContainerGap(25, Short.MAX_VALUE))

);

jPanel3Layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {cheng, chu, dian, jButton1, jButton2, jButton3, jButton4, jButton5, jButton6, jButton7, jButton8, jButton9, jia, jian});

jPanel3Layout.setVerticalGroup(

jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(jPanel3Layout.createSequentialGroup()

.addContainerGap()

.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 63, javax.swing.GroupLayout.PREFERRED_SIZE)

.addGap(18, 18, 18)

.addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)

.addComponent(jButton8)

.addComponent(jButton7)

.addComponent(jButton9)

.addComponent(chu)

.addComponent(fanhui))

.addGap(18, 18, 18)

.addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addComponent(jButton4, javax.swing.GroupLayout.PREFERRED_SIZE, 23, javax.swing.GroupLayout.PREFERRED_SIZE)

.addComponent(jButton5, javax.swing.GroupLayout.PREFERRED_SIZE, 23, javax.swing.GroupLayout.PREFERRED_SIZE)

.addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)

.addComponent(jButton6)

.addComponent(cheng)

.addComponent(qingling)))

.addGap(18, 18, 18)

.addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(jPanel3Layout.createSequentialGroup()

.addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 23, javax.swing.GroupLayout.PREFERRED_SIZE)

.addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)

.addComponent(jButton2)

.addComponent(jButton3)

.addComponent(jian)))

.addGap(18, 18, 18)

.addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)

.addComponent(jButton10)

.addComponent(dian)

.addComponent(jia)))

.addComponent(dengyu, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))

);

jPanel3Layout.linkSize(javax.swing.SwingConstants.VERTICAL, new java.awt.Component[] {cheng, chu, dian, jButton1, jButton2, jButton3, jButton4, jButton5, jButton6, jButton7, jButton8, jButton9, jia, jian});

jLabel1.setIcon(new javax.swing.ImageIcon("C:\\Users\\Administrator\\Desktop\\20140314105113973.jpg")); // NOI18N

jLabel1.setText("jLabel1");

javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);

jPanel1.setLayout(jPanel1Layout);

jPanel1Layout.setHorizontalGroup(

jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGap(0, 314, Short.MAX_VALUE)

.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(jPanel1Layout.createSequentialGroup()

.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 314, javax.swing.GroupLayout.PREFERRED_SIZE)

.addGap(0, 0, Short.MAX_VALUE)))

);

jPanel1Layout.setVerticalGroup(

jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGap(0, 318, Short.MAX_VALUE)

.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 318, Short.MAX_VALUE))

);

javax.swing.GroupLayout jLayeredPane1Layout = new javax.swing.GroupLayout(jLayeredPane1);

jLayeredPane1.setLayout(jLayeredPane1Layout);

jLayeredPane1Layout.setHorizontalGroup(

jLayeredPane1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jLayeredPane1Layout.createSequentialGroup()

.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)

.addComponent(jPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

.addContainerGap())

.addGroup(jLayeredPane1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(jLayeredPane1Layout.createSequentialGroup()

.addGap(0, 0, Short.MAX_VALUE)

.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

.addGap(0, 0, Short.MAX_VALUE)))

);

jLayeredPane1Layout.setVerticalGroup(

jLayeredPane1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(jLayeredPane1Layout.createSequentialGroup()

.addContainerGap()

.addComponent(jPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

.addContainerGap(71, Short.MAX_VALUE))

.addGroup(jLayeredPane1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(jLayeredPane1Layout.createSequentialGroup()

.addGap(0, 0, Short.MAX_VALUE)

.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

.addGap(0, 0, Short.MAX_VALUE)))

);

jLayeredPane1.setLayer(jPanel3, javax.swing.JLayeredPane.DEFAULT_LAYER);

jLayeredPane1.setLayer(jPanel1, javax.swing.JLayeredPane.DEFAULT_LAYER);

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());

getContentPane().setLayout(layout);

layout.setHorizontalGroup(

layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(layout.createSequentialGroup()

.addGap(0, 0, Short.MAX_VALUE)

.addComponent(jLayeredPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

.addGap(0, 0, Short.MAX_VALUE))

);

layout.setVerticalGroup(

layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()

.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)

.addComponent(jLayeredPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))

);

pack();

}// </editor-fold>//GEN-END:initComponents

private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jTextField1ActionPerformed

// TODO add your handling code here:

}//GEN-LAST:event_jTextField1ActionPerformed

public void setNum(String str){

String strText= jTextField1.getText();

if(strText.equals("0")){

jTextField1.setText(str);

}else{

// jTextField1.setText(strText+str);

StringBuffer strBuf = new StringBuffer(jTextField1.getText());

if (strBuf.length() < 3) {

//String strText2 = new String(strBuf);

jTextField1.setText(strBuf + str);

} else {

char ch1 = strBuf.charAt(strBuf.length() - 1);

char ch2 = strBuf.charAt(strBuf.length() - 2);

if (ch1 == '0' && (ch2 == '+' || ch2 == '-' || ch2 == '*' || ch2 == '/')) {

strBuf.deleteCharAt(strBuf.length() - 1);

String strText1 = new String(strBuf);

jTextField1.setText(strText1 + str);

} else {

String strText2 = new String(strBuf);

jTextField1.setText(strText2 + str);

}

private void jButton1MouseReleased(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_jButton1MouseReleased

// TODO add your handling code here:

setNum("1");

}//GEN-LAST:event_jButton1MouseReleased

private void qinglingMouseReleased(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_qinglingMouseReleased

// TODO add your handling code here:

jTextField1.setText("0");

}//GEN-LAST:event_qinglingMouseReleased

private void fanhuiMouseReleased(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_fanhuiMouseReleased

// TODO add your handling code here:

String str=new String(jTextField1.getText());

if(str.length()>1){

StringBuffer strBuf=new StringBuffer(str) ;

strBuf.deleteCharAt(strBuf.length()-1);

jTextField1.setText(strBuf.toString());

}

else{

jTextField1.setText("0");

}

}//GEN-LAST:event_fanhuiMouseReleased

private void jButton2MouseReleased(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_jButton2MouseReleased

// TODO add your handling code here:

setNum("2");

}//GEN-LAST:event_jButton2MouseReleased

private void jButton3MouseReleased(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_jButton3MouseReleased

// TODO add your handling code here:

setNum("3");

}//GEN-LAST:event_jButton3MouseReleased

private void jButton4MouseReleased(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_jButton4MouseReleased

// TODO add your handling code here:

setNum("4");

}//GEN-LAST:event_jButton4MouseReleased

private void jButton5MouseReleased(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_jButton5MouseReleased

// TODO add your handling code here:

setNum("5");

}//GEN-LAST:event_jButton5MouseReleased

private void jButton6MouseReleased(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_jButton6MouseReleased

// TODO add your handling code here:

setNum("6");

}//GEN-LAST:event_jButton6MouseReleased

private void jButton7MouseReleased(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_jButton7MouseReleased

// TODO add your handling code here:

setNum("7");

}//GEN-LAST:event_jButton7MouseReleased

private void jButton8MouseReleased(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_jButton8MouseReleased

// TODO add your handling code here:

setNum("8");

}//GEN-LAST:event_jButton8MouseReleased

private void jButton9MouseReleased(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_jButton9MouseReleased

// TODO add your handling code here:

setNum("9");

}//GEN-LAST:event_jButton9MouseReleased

private void jButton10MouseReleased(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_jButton10MouseReleased

// TODO add your handling code here:

setNum("0");

}//GEN-LAST:event_jButton10MouseReleased

private void dianMouseReleased(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_dianMouseReleased

// TODO add your handling code here:

//setNum(".");

}//GEN-LAST:event_dianMouseReleased

public void setYSE(String str){

//取出当前显示的内容放到字符串strText中

String strText = jTextField1.getText();

int lastRight = strText.length() - 1;

char ch = strText.charAt(lastRight);

if(ch=='+'||ch=='-'||ch=='*'||ch=='/'){

String strResult = strText.substring(0,lastRight)+str;

jTextField1.setText(strResult);

}else{

jTextField1.setText(strText+str);

}

private void jiaMouseReleased(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_jiaMouseReleased

// TODO add your handling code here:

setYSE("+");

}//GEN-LAST:event_jiaMouseReleased

private void jianMouseReleased(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_jianMouseReleased

// TODO add your handling code here:

setYSE("-");

}//GEN-LAST:event_jianMouseReleased

private void chengMouseReleased(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_chengMouseReleased

// TODO add your handling code here:

setYSE("*");

}//GEN-LAST:event_chengMouseReleased

private void chuMouseReleased(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_chuMouseReleased

// TODO add your handling code here:

setYSE("/");

}//GEN-LAST:event_chuMouseReleased

private void dengyuMouseReleased(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_dengyuMouseReleased

// TODO add your handling code here:

ScriptEngineManager manager=new ScriptEngineManager();

ScriptEngine se=manager.getEngineByName("js");

Double result=null;

try {

result=(Double)se.eval("("+jTextField1.getText()+")*1.0");

} catch (ScriptException ex) {

Logger.getLogger(NewJFrame.class.getName()).log(Level.SEVERE, null, ex);

}

jTextField1.setText(result.toString());

}//GEN-LAST:event_dengyuMouseReleased

private void dianActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_dianActionPerformed

// TODO add your handling code here:

String strText = jTextField1.getText();

if (strText.equals("0")) {

jTextField1.setText(strText + ".");

} else {

StringBuffer strBuf = new StringBuffer(jTextField1.getText());

// if(strBuf.length()<2){

// jTextField.setText(strBuf+".");

// }else{

int temp = 0;

int i = strBuf.length() - 1;

while (i > strBuf.lastIndexOf("+") && i > strBuf.lastIndexOf("-") && i > strBuf.lastIndexOf("*") && i > strBuf.lastIndexOf("/")) {

if (strBuf.charAt(i) == '.') {

temp = i;

break;

} else {

i--;

temp = i;

}

System.out.print(i);

}

//String str = new String(strBuf);

if (temp == strBuf.lastIndexOf("+") || temp == strBuf.lastIndexOf("-") || temp == strBuf.lastIndexOf("*") || temp == strBuf.lastIndexOf("/") || temp == 0) {

jTextField1.setText(strBuf.toString() + ".");

System.out.print(strBuf.lastIndexOf("+"));

} else {

jTextField1.setText(strBuf.toString());

System.out.print(strBuf.lastIndexOf("+"));

System.out.print(temp);

}

}//GEN-LAST:event_dianActionPerformed

public static void main(String args[]) {

//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">

try {

for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {

if ("Nimbus".equals(info.getName())) {

javax.swing.UIManager.setLookAndFeel(info.getClassName());

break;

}

} catch (ClassNotFoundException ex) {

java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

} catch (InstantiationException ex) {

java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

} catch (IllegalAccessException ex) {

java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

} catch (javax.swing.UnsupportedLookAndFeelException ex) {

java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

}

//</editor-fold>

java.awt.EventQueue.invokeLater(new Runnable() {

public void run() {

new NewJFrame().setVisible(true);

}

});

}

// Variables declaration - do not modify//GEN-BEGIN:variables

private javax.swing.JButton cheng;

private javax.swing.JButton chu;

private javax.swing.JButton dengyu;

private javax.swing.JButton dian;

private javax.swing.JButton fanhui;

private javax.swing.JButton jButton1;

private javax.swing.JButton jButton10;

private javax.swing.JButton jButton2;

private javax.swing.JButton jButton3;

private javax.swing.JButton jButton4;

private javax.swing.JButton jButton5;

private javax.swing.JButton jButton6;

private javax.swing.JButton jButton7;

private javax.swing.JButton jButton8;

private javax.swing.JButton jButton9;

private javax.swing.JLabel jLabel1;

private javax.swing.JLayeredPane jLayeredPane1;

private javax.swing.JPanel jPanel1;

private javax.swing.JPanel jPanel3;

private javax.swing.JTextField jTextField1;

private javax.swing.JButton jia;

private javax.swing.JButton jian;

private javax.swing.JButton qingling;

// End of variables declaration//GEN-END:variables

}

JAVA 简易计算器

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